REPRODUCTION

Question 1

What is sexual reproduction?

Answer 1

fusion of male + female gametes during fertilisation to produce non-identical offspring that inherit characteristics from both parents

Question 2

What is asexual reproduction?

Answer 2

doesnt involve sex cells or fertilisation
only one parent is required so theres no fusion o0f gametes + no mixing of genetic information.
As a result, offspring are genetically identical to parent + each other (clones)

Question 3

How do gametes differ from a normal cell?

Answer 3

Gametes contain half the number of chromosomes found in other body cells

Question 4

Why do Gametes only contain half the number of chromosomes found in other body cells?

Answer 4

They only contain ONE COPY OF EACH CHROMOSOME

rather than 2 like body cells

Question 5

How many chromosomes does a normal body cell in a human being have?

Answer 5

46 CHROMOSOMES

each gamete contains 23

Question 6

What is a zygote?

Answer 6

When male + female gamete fuse they become a zygote (FERTILISED EGG CELL)
-zygote contains full 46 chromosomes (half from mother + half from father)

Question 7

How does a zygote develop into an embryo?

Answer 7

Zygote undergoes cell division + after few days forms an EMBRYO.
Cell division continues + eventually many of new cells produced become specialised to perform particular functions + form all body tissues of offspring.

Question 8

How many chromosomes does an embryo contain?

Answer 8

46